Research on Simulation of Finite Bipolar Soft Switch Welding Power Supply
The finite bipolar full-bridge soft switch overcame the problems of loss of duty cycle and small load range of the soft-bridge in the process of phase-shifting full-bridge soft switching,and reduced the switching loss of the full-bridge in-verter circuit,while the arc load in the welding process was in a no-load state,and it was difficult to achieve zero-voltage switching when the finite bipolar full-bridge soft switch was no-load.The ISOP topology structure could reduce the voltage drop of the switch,so that the low-withstand voltage switch could be selected,and the loss of the circuit was further re-duced.Based on the finite bipolarity control strategy,the ISOP topology structure was selected,and the double-current rec-tifier circuit was used to realize the soft switching in the full load range,and the soft switching situation and the turn-off loss of the advance arm were simulated and studied by the PSpice simulation software,which provided a research basis for the ac-tual circuit.The welded power supply was soft switching in the full load range,and it was compared that the temperature rising of the power supply under the working conditions of hard switching and soft switching,the temperature rising of hard switching was smaller in the case of no load and the temperature rising of soft switching was smaller in the case of heavy load.
finite bipolaritysoft switchingISOPpressure and current sharingPspiceswitching lossestempera-ture rising test
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